4. Rewrite the sentences with the words in the brackets.
(Viết lại các câu với các từ trong ngoặc.)
1. We should stop using fossil fuels. They cause pollution. (… because …)
2. We should choose solar energy. Otherwise, we should choose wind power. (… or …)
3. Wind power is renewable. It is safe. (… and …)
4. Nuclear power is unlimited. It is unsafe. (, but …)
5. Nuclear power is unlimited. It is unsafe. (; however, …)
1:we should stop using fossil fuels because they cause pollution
2: We should choose solar energy or wind power
3: Wind power is renewable and safe
4: Nuclear power is unlimited, but it is unsafe
5: Nuclear power is unlimited; however, it is unsafe